Removing iCal calendars from sidebar but keeping the events

I'm having a little bit of confusion over iCal. I have a few calendars that I don't need to use anymore as they held appointments at my former job. Therefore, I really don't need/want to see them in my sidebar every day. I'd like to remove them from the sidebar, but when I do that, I get a warning that I'm going to be deleting all the events. I want to keep the old events as a reference for the future, so is there any way I can get rid of (or at least hide) the calendar name in the sidebar without deleting the events?

You could create a new Calendar Group and put all the ones you don't want to look at in there, then hide that group.

Click to expand...

I just tried doing that but iCal won't let me drag and drop my calendars into a group. Right now in my sidebar there are two sections: "On my Mac" and my MobileMe name (firstname.lastname). When I try to drag my calendars (which are all under the MobileMe section) to the new folder under "On my Mac" they won't go there. I also can't seem to make a new folder under "firstname.lastname." I know I've made calendar folders in the past for classes when I was in school...

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